Length

• A rule (ruler) is used to measure length for distances between 1 mm and 1 meter. For even smaller lengths, use a micrometer screw gauge.
• To find out volume of regular object, use mathematical formula
• SI unit for length is the meter (m)
• To find out volume of irregular object, put object into measuring cylinder with water. When object added, it displaces water, making water level rise. Measure this rise. This is the volume.
• Interval of time is measured using clocks or a stopwatch
• SI unit for time is the second (s)
• To find the amount of time it takes a pendulum to make a spin, time ~25 circles and then divide by the same number as the number of circles.